type Query {
    currencies: [Currency]!,
    currency(uuid: String!): Currency!,

    categories: [Category]!,
    category(uuid: String!): Category!,

    accounts: [Account]!,
    account(uuid: String!): Account!,

    contacts: [Contact]!,
    contact(uuid: String!): Contact!,

    transaction(uuid: String!): Transaction!,
    transactionsByYearAndMonth(year: Int, month: Int): [Transaction]!
}
